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At a certain university, the average cost of books was $320 per student last semester and the population standard deviation was $85. This semester a sample of 55 students revealed an average cost of books of $355 per student. The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
A) 0.41
B) 0.64
C) 3.05
D) 22.6
Make an interval estimate the population means score for the daycare children so that you are 95% confident that the true mean is in your interval.
Suppose that verbal scores on SAT exam have a normal distribution with a population mean 500 points and population standard deviation of 100.
On average, you receive 2 telemarketing calls per day. What is the probability that you will not receive any telemarketing calls today.
For a population with a mean of (u)=50 and a standard deviation of (o)=10, how much error on average would you expect between the sample mean (M) and the population mean for the following samples
The test statistics in a right tailed test is z= 2.50. Also use a .05 significance level and state the conclusion about the null hypothesis (reject null hypothesis or fail to reject the null hypothsis)
A poll found that 38% of male voters and 46% of female voters support a particular candidate. To test whether this candidate has equal levels of support between male and female voters, the null hypothesis should be:
A real estate agent in the coastal area of Georgia wants to compare the variation in the selling price of homes on the oceanfront with those one to three blocks from the ocean sample of 21 oceanfront homes sold within the last year revealed the st..
Given 5,000 light bulbs from an outside supplier. If past performance data indicates that these have been 3% defective, and a random sample of 40 parts are drawn from the shipment what is the probability that you will find more than 2 defective pa..
If 900 users visited the site, would the probability that more than 250 of them click on an ad be higher or lower than the answer found in part
As sample size increases, the standard error of M _______________ .
An instructor has a test bank consisting of 300 easy true-false questions, 200 difficult true-false questions, 500 easy multiple choice questions and 400 difficult multiple choice questions.
A random sample of 41 basketball players from The Official NBA Basketball Encyclopedia gave the sample standard deviation for player height as s=3.32 inches.
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